Bad normal map baking
If you have just started blender the struggle is real hahaha. 
Jokes aside probably your ray distance is really big. Try from .010 too .100
See if it works.

Also remember that both high and lowpoly meshes need to be in the exact space.
And remember you need to check the selected active check box. and select first the highpoly, and then the lowpoly. then pressed bake, but i assume you already know that.

Goodluck.